Add support for tox to run tests against Django 1.X/2.0

.gitignore

@@ -19,3 +19,6 @@ dist/
 
 # Ignore PyCharm
 .idea/
+
+# Ignore tox environments
+.tox/

.scrutinizer.yml

@@ -28,7 +28,7 @@ build:
             -
                 command: flake8 ./localized_fields/
             -
-                command: coverage run manage.py test
+                command: tox
                 coverage:
                     file: '.coverage'
                     format: 'py-cc'

requirements/test.txt

@@ -1,6 +1,5 @@
 -r base.txt
 
-Django==1.11.9
 django-autoslug==1.9.3
 django-bleach==0.3.0
 django-coverage-plugin==1.3.1
@@ -14,3 +13,4 @@ django-coverage-plugin==1.3.1
 flake8==3.5.0
 pep8==1.7.1
 dj-database-url==0.4.2
+tox==2.9.1

tox.ini

@@ -0,0 +1,12 @@
+[tox]
+envlist = py35-dj{111,20}
+
+[testenv]
+deps =
+    dj111: Django>=1.11,<1.12
+    dj20: Django>=2.0,<2.1
+    -rrequirements/test.txt
+setenv =
+    DJANGO_SETTINGS_MODULE=settings
+passenv = DATABASE_URL
+commands = coverage run manage.py test